Maxwell-Stefan diffusion coeff. were detd. in multi component gaseous mixts. under elevated pressure (dense gases). Under such conditions, fugacity coeff. of the components differed from unity. To det. the molar vol. of gases, the Peng-Robinson equation of state was used. Binary Maxwell-Stefan diffusion coeff. in infinite diln. were detd. by an unified empirical method. An efficient algorithm for numerical computations was also developed to prepare numerical codes.